JP2002357363A - Hot-water supplier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot-water supplier equipped with a heat exchanger, capable of being exchanged simply, eliminating the mixing of hot-water for bathing into hot-water in a hot-water tank and capable of effecting the thermal insulation and re-heating of bathing water in a bathtub. SOLUTION: The hot-water supplier is equipped with the hot-water tank 2, a heat generating body 6 for heating water in the hot-water tank 2 and a circulating unit A for circulating water through a heat exchanger 5 employing the hot-water in the hot-water tank 2, which is heated by the heat generating body 6, as a heat source. In such a hot-water supplier, the heat exchanger 5 is constituted integrally with a water passing tube 30 and a heater 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply device provided with a heat exchanger, and more particularly, uses hot water in a hot water tank as a heat source to heat, reheat, or heat water in a bathtub. The present invention relates to a hot water supply device provided with a heat exchanger that can perform hot water.

[0002]

2. Description of the Related Art FIG. 5 is a diagram showing an example of the overall configuration of a conventional hot water supply apparatus. As shown in the figure, in the hot water supply device, the hot water boiled in the hot water tank 2 of the hot water supply device main body 40 is guided to the bathtub 3 through the first hot water supply pipe 11 to fill the bath water 10 or the second hot water supply. It is led to the mixing tap 4 through the pipe 12 and used for bathing and cooking.

When the bath water is used and the bath water 10 is used or the bath water 10 is left, the temperature of the bath water 10 in the bath tub 3 gradually decreases. Therefore, the pump 28 is operated to periodically guide the bath water 10 in the bathtub 3 to the hot water temperature detector 26 to measure the hot water temperature. Then, when the temperature of the hot water drops below the set temperature, the bath water 10 in the bathtub 3 is passed through the first circulation pipe 20 by the pump 28, and the three-way valve 27 for switching between heat retention and reheating is provided.
To the heat exchanger 41 in the hot water tank 2. In the heat exchanger 41, the bath water 10 is heated by using the heat of the hot water in the hot water tank 2, and is passed through the second circulation pipe 21.
, And the bath 10 in the bathtub 3 is kept warm and reheated.

FIGS. 6A and 6B show the heat exchanger 41 of FIG.
It is the front view and top view which show the detail of. Heat exchanger 41
Is a spirally arranged thin metal pipe 42 made of copper or the like. The bath water 10 is passed through the metal pipe 42,
The bath water 10 in the bath tub 3 is heated in a short time by heating the bath water 10 using the heat of the hot water in the hot water tank 2.

[0005]

According to the hot water supply apparatus constructed as described above, the heat exchanger 4 for keeping heat and reheating is used.
In No. 1, a thin metal pipe 42 made of copper or the like is spirally arranged and inserted directly into the hot water tank 2 to perform heat exchange. Therefore, although the efficiency of the heat exchanger 41 is good, the bath water 10 flowing in the heat exchanger 41 and the hot water in the hot water tank 2 are separated only by the metal pipe 42, and the metal pipe 42 is corroded and Then, hot water in the hot water tank 2 flows out into the bath tub 3 through the pipe of the metal pipe 42, or bath water 10 flows out into the hot water tank 2, passes through the second hot water supply pipe 12, and is mixed with a mixing plug. 4. Furthermore, when all the hot water in the hot water tank 2 is used, the heating element 6 is energized in order to secure a heat source for heat retention and reheating, and is used until the water in the hot water tank 2 becomes hot water. could not.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and even when a hole is formed in a metal pipe of a heat exchanger, it can be detected that the hole has been formed and the metal pipe can be easily replaced. The hot water in the hot tub is not mixed with the hot water in the hot water tank, and even if the hot water in the hot water tank runs out, the heat exchanger can keep the bath water in the bath tub and reheat it. It is an object to provide a hot water supply device.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a hot water tank, a heating element for heating water in the hot water tank, and a heat exchanger using hot water in the hot water tank heated by the heating element as a heat source. This is a hot water supply device having a circulating portion for circulating water, wherein the heat exchanger and the water pipe are integrated.
Further, a heater was provided on the outer periphery of the water pipe.

[0008] The water pipe is constituted by an inner pipe and an outer pipe having a closed end and containing the inner pipe. The water pipe is housed in a metal pipe, and the metal pipe and the water pipe are connected to each other. A heater was provided between them. Alternatively, the water pipe was formed in a U-shape and housed in a U-shaped metal pipe, and a heater was disposed between the metal pipe and the water pipe.

[0009]

[First Embodiment] FIG. 1 is a diagram showing an entire configuration of a hot water supply apparatus according to a first embodiment of the present invention, and FIG.
(A), (b) is the longitudinal cross-sectional view which shows the detail of the heat exchanger with a heater of FIG. 1, and its II sectional view. In FIG.
1 is a hot water supply main body, 2 is a hot water tank installed in the hot water supply main body 1, 3 is a bathtub, and 4 is a mixing tap. Reference numeral 5 denotes a heat exchanger with a heater disposed at an upper portion in the hot water tank 2, 6 a heating element disposed at a lower portion in the hot water tank 2, 7 a tank water inlet, and 8 a tank tap. 9 is a bathtub adapter provided in the bathtub 3 and 10 is bath water.

[0010] Reference numerals 11 and 12 denote a first hot water supply pipe and a second hot water supply pipe each having one end connected to a tank outlet 8, and the other ends thereof connected to a bathtub adapter 9 and a mixing tap 4, respectively. Reference numeral 13 denotes a water supply pipe, which branches into a first water supply pipe 14 and a second water supply pipe 15, and one end of the first water supply pipe 14 is provided with a mixing valve 16.
Is connected to the first hot water supply pipe 11 via the
One end of 5 is connected to mixing tap 4. Reference numerals 17 and 18 denote a pressure reducing valve and a water supply side check valve provided in the first water supply pipe 14, respectively. The water supply side check valve 18 is connected to the tank water supply port 7.
Reference numeral 19 denotes a relief valve for discharging the volume expansion of the hot water due to the heating to the outside of the water heater main body 1.

Reference numerals 20 and 21 denote a first circulation pipe and a second circulation pipe each having one end connected to the heat exchanger with heater 5. The other ends of the first circulation pipe 20 are connected via a three-way valve 22. Connected to the first hot water supply pipe 11 and the second circulation pipe 21
Is connected to a bathtub adapter 9 to form a circulation section A. Reference numerals 23, 24, and 25 denote a flow meter, a water stop valve and a filling check valve provided between the mixing valve 16 and the three-way valve 22 of the first hot water supply pipe 11. 26 is the first hot water supply pipe 1
1 is a temperature detector provided between the three-way valve 22 and the bathtub adapter 9. Reference numeral 27 denotes a three-way valve for switching between warming and reheating, which switches the bath water 10 so as not to pass through the heat exchanger 5 with a heater when measuring the hot water temperature of the bath water 10, and is provided in the first circulation pipe 20. The second circulation pipe 21 is connected.
Reference numeral 28 denotes a pump provided between the three-way valve 27 and the three-way valve 22 for switching between heat retention and reheating of the first circulation pipe 20, and reference numeral 29 a denotes a water level meter provided in the second circulation pipe 21.

In the heat exchanger with heater 5 shown in FIG.
Reference numeral 29 denotes a flange for attaching the heat exchanger with heater 5 to the hot water tank 2. Reference numeral 30 denotes a water pipe disposed inside the center of the heater heat exchanger 5, and its outer periphery is covered with a heater portion B. The water pipe 30 has a double structure with an inner pipe 30a and an outer pipe 30b in which the inner pipe 30a is housed.
Is guided to the vicinity of the tip of the heat exchanger with heater 5 by the inner pipe 30a, is heated when flowing into the outer pipe 30b and passes through the inside thereof, and exits through the water outlet 32. The heater section B insulates a heating wire (heater) 33 with an insulating material 34, covers the outer periphery thereof with a metal pipe 35, and separates it from hot water in the hot water tank 2. Numeral 36 denotes a lead bar, which is a section for conducting electricity. The heat of the heating wire 33 which is energized by the lead bar 36 and generates heat is supplied through the water pipe 30 or the metal pipe 35 to the bath water 10 in the bath tub 3 or the hot water tank The hot water in 2 is heated.

The operation of the first embodiment configured as described above will be described. The water injected from the water supply pipe 13 passes through a pressure reducing valve 17 for protecting the hot water tank 2 and a water supply side check valve 18, and is injected into the hot water tank 2 from the tank water supply port 7. The injected water fills the hot water tank 2 and is heated by the heating element 6 to become hot water. At this time, the volume expansion of the hot water due to the heating is discharged to the outside of the hot water supply device main body 1 through the relief valve 19.

The boiled hot water is guided from the tank outlet 8 through the second hot water supply pipe 12 to the mixing tap 4, and is supplied to the water supply pipe 13.
Is mixed with water guided to the mixing tap 4 through the second water supply pipe 15. When bath water 10 is filled in bathtub 3, hot water boiled in hot water tank 2 is mixed with water sent from first water supply pipe 14 through mixing valve 16 through first hot water supply pipe 11. To a temperature suitable for bathing. The temperature of the mixed hot water is measured by the temperature detector 26 to check whether the temperature has reached the set hot water temperature. If there is a difference from the set hot water temperature, the mixing valve 16 is adjusted to correct the hot water temperature.

The flow meter 23 manages the amount of hot water in the bath water 10 that is set in the bath tub 3. The amount of hot water for filling an appropriate amount of bath water 10 in the bathtub 3 is set in advance, and when the amount reaches the set amount as measured by the flow meter 23, the water is stopped by the water stop valve 24 and the filling is stopped. The hot water whose water temperature and volume is controlled in this way passes through the hot water side check valve 25 and the three-way valve 22 for switching the flow path of the hot water and the warming and reheating of the bath water 10 to the first hot water supply pipe. 11, an appropriate temperature and an appropriate amount of bath water 10 are applied to the bath tub 3 via the bath tub adapter 9.

When bathing is performed and the amount of bath water 10 in the bathtub 3 decreases, the water level meter 29 detects the amount of bath water 10 and
The reduced amount of bath water is recovered in the same procedure as in the above hot water filling. When all the hot water in the hot water tank 2 is used and the inside of the hot water tank 2 becomes water, it takes a considerable time to boil the hot water using the heating element 6. Therefore, a small amount of hot water can be boiled in a short time by energizing the heater section B of the heat exchanger 5 with a heater.

By taking a bath and using or leaving the bath water 10 in the bathtub 3, the temperature of the bath water 10 gradually decreases. Therefore, the bath water 10 in the bath tub 3 is periodically driven by the pump 28 and guided to the hot water temperature detector 26 to measure the hot water temperature.
0 is passed through the first circulation pipe 20 by the pump 28, and is introduced into the heat exchanger with heater 5 through the three-way valve 27 for switching between warming and reheating, and the bath is heated by using the heat of the hot water in the hot water tank 2. Heat water 10. Then, the heated bath water 10 is returned to the bath tub 3 through the second circulation pipe 21 and the bath water 10 in the bath tub 3 is returned.
Raise the hot water temperature and return to the set hot water temperature to keep it warm. Also,
When the temperature of the bath water 10 in the bathtub 3 is arbitrarily increased, the bath water 10 is reheated to the set hot water temperature in the same procedure as the above-mentioned heat retention.

When the hot water in the vicinity of the heat exchanger 5 with heater is exhausted by using the hot water in the hot water tank 2, the heat exchanger 5 with heater is heated and reheated while energizing. The temperature of the water 10 can be raised. That is, as shown in FIG.
0 through the inner pipe 30a to the vicinity of the distal end of the heat exchanger 5 with a heater, and when passing through the outer pipe 33b, the lead bar 36 is energized and heated by the heating wire 33 which has generated heat. To rise. At this time, the hot water in the hot water tank 2 is also heated via the metal pipe 35 at the same time.

If the heat exchanger with heater 5 has been used for a long time, the part in contact with water may be corroded. When the metal pipe 35 and the water pipe 30 of the heat exchanger with heater 5 are corroded and perforated, the hot water in the hot water tank 2 and the bath water 10 passing through the heat exchanger with heater 5 are insulated from the heater B. The material 34 penetrates and loses insulation with the heating wire 33, causing an electric leakage. However, by detecting this leakage state with the leakage circuit breaker, it is possible to early discover that the heat exchanger with heater 5 has become corroded and unusable.

According to the hot water supply apparatus having the heat exchanger with heater 5 according to the present embodiment, even if the metal pipe 35 or the water pipe 30 of the heat exchanger with heater 5 has a hole, the bath water 10
And the hot water in the hot water tank 2 are not mixed, and it is possible to detect that a hole has been made, and it is possible to replace the tank at an early stage. Further, even if the hot water in the hot water tank 2 runs out and becomes water, the bath water 10 in the bath tub 3 can be kept warm and reheated.

[Embodiment 2] FIG. 3 is a diagram showing an overall configuration of a heating / hot water supply apparatus according to Embodiment 2 of the present invention, and FIG.
(A), (b) is a longitudinal section and its II-II sectional view showing details of the heat exchanger with a heater in FIG. In FIG. 3, 1
a is the main body of the heating / hot water supply device, 37 is a radiator, 20, 2
Reference numeral 1 denotes a first circulation pipe and a second circulation pipe each having one end connected to the heat exchanger 5 with a heater. The other ends of the circulation pipes 20 and 21 are connected to a radiator 37. A rust-preventive circulating liquid circulates inside 20, 21. In the present embodiment, the first hot water supply pipe 11 shown in the first embodiment, the mixing valve 16 associated therewith, and the flow meter 2
3. The water stop valve 24, the hot water check valve 25, the three-way valve 22, and the temperature detector 26 are not provided.

In the heat exchanger with heater 5 shown in FIG.
Reference numeral 29 denotes a flange for attaching the heat exchanger with heater 5 to the hot water tank 2. Reference numeral 30 denotes a U-shaped water pipe disposed at the center of the heat exchanger 5 with a heater, and the outer periphery thereof is covered with a heater section B. The heater section B is formed by insulating a heating wire 33 connected to a lead bar 36 with an insulating material 34, and covering the outer periphery of the heating wire 33 with a U-shaped metal pipe 35.
It is separated from the hot water inside. Other configurations are substantially the same as those shown in FIGS. 1 and 2, and thus description thereof is omitted.

The operation of the second embodiment configured as described above will be described. From the water supply pipe 13, the main unit 1 of the heating / hot water supply device
The water injected into the tank a passes through a pressure reducing valve 17 for protecting the hot water tank 2 and a check valve 18 on the water supply side, and is supplied to the tank water inlet 7.
From the hot water tank 2. The injected water fills the hot water tank 2 and is heated by the heating element 6 to become hot water. At this time, the volume expansion of the hot water due to the heating is discharged to the outside of the main body 1a of the heating / hot water supply device by the relief valve 19. The boiled hot water is guided from the tank outlet 8 to the mixing tap 4 through the second hot water supply pipe 12, and is supplied to the water supply pipe 13, the second hot water supply pipe 13.
Is used by being mixed with the water guided to the mixing tap 4 through the water supply pipe 15.

Utilizing the hot water in the hot water tank 2, the rust-preventive circulating liquid is heated to a high temperature by the heat exchanger 5 with a heater, and the pump 28 is driven to send the hot water to the radiator 37 in the room. The room is heated by releasing the heat obtained from the rust preventive circulating fluid from the radiator 37. If the hot water in the vicinity of the heat exchanger 5 with the heater is exhausted by using the hot water in the hot water tank 2, the rust preventive circulating fluid is heated by energizing the heat exchanger 5 with the heater. Heating can be done immediately. That is, as shown in FIG. 4, the heat of the heat generating wire 33 which is heated by being energized from the lead bar 36 heats the rust preventive circulating liquid via the water pipe 30. At this time, the hot water in the hot water tank 2 is also heated via the metal pipe 35 at the same time.

If the heat exchanger with heater 5 has been used for a long time, the portion in contact with water may be corroded. When the metal pipe 35 and the water pipe 30 are corroded and a hole is opened,
The hot water and the rust-preventive circulating liquid permeate into the insulating material 34 of the heater section B,
Leakage occurs due to loss of insulation from the heating wire 33. However, by detecting with the earth leakage breaker, it is possible to early discover that the heat exchanger with heater 5 has become corroded and cannot be used.

According to the heating and hot water supply apparatus provided with the heat exchanger with heater 5 according to the present embodiment, even when the metal pipe 35 and the water pipe 30 of the heat exchanger with heater 5 have holes, rust prevention is possible. The circulating fluid and the hot water in the hot water tank 2 do not mix with each other, it is possible to detect that a hole has been made, and even if the hot water in the hot water tank 2 runs out and becomes water,
Rust prevention circulating fluid can be heated.

[0027]

As is apparent from the above description, the present invention relates to a hot water tank, a heating element for heating water in the hot water tank, and a heat source using hot water in the hot water tank heated by the heating element. A hot water supply device having a circulating section that circulates water through an exchanger. Since the heat exchanger has a water pipe and a heater integrated into one, even if hot water in the hot water tank runs out and becomes water, a bathtub is provided. And heat and heat the water of the radiator.

Further, since a heater is provided on the outer periphery of the water pipe, a small amount of hot water can be boiled in a short time by energizing the heater of the heat exchanger with a heater.

Further, the water pipe is constituted by an inner pipe and an outer pipe whose front end is closed and in which the inner pipe is housed. The water pipe is housed in a metal pipe and the metal pipe and the water pipe are connected to each other. A heater is arranged in between, or a water pipe is configured in a U-shape and housed in a U-shaped metal pipe,
Since the heater was arranged between the metal pipe and the water pipe, by supplying electricity to the heater of the heat exchanger with heater,
A small amount of hot water can be boiled in a short time.

Further, even when a hole is formed in the metal pipe or the water pipe of the heat exchanger with a heater, the circulating fluid such as bath water or rust-preventive circulating fluid does not mix with the hot water in the hot water tank. It is possible to detect that it has happened and replace it early.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a hot water supply apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a vertical section showing a detailed configuration of the heat exchanger with a heater in FIG. 1 and a II section thereof.

FIG. 3 is a diagram showing an overall configuration of a heating / hot water supply apparatus according to Embodiment 2 of the present invention.

4 is a vertical sectional view showing a detailed configuration of the heat exchanger with a heater in FIG. 3 and a II-II sectional view thereof.

FIG. 5 is a diagram showing an entire configuration of a conventional hot water supply apparatus.

6 is a front view and a plan view showing a detailed configuration of the heat exchanger of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hot water supply main body, 2 Hot water tank, 5 Heat exchanger with heater, 6 Heating element, 30 Water pipe, 30a inner pipe, 30b outer pipe, 33 Heating wire (heater), 3
4 Insulation material, 35 metal pipes, A circulation part, B heater part.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshikazu Terauchi 2-6-2 Otemachi, Chiyoda-ku, Tokyo F-term (reference) in Mitsubishi Electric Engineering Co., Ltd. 3L025 AB24

Claims (4)

[Claims] 1. A hot water tank, a heating element for heating water in the hot water tank, and a circulating section for circulating water through a heat exchanger that uses hot water in the hot water tank heated by the heating element as a heat source. A hot water supply apparatus comprising: a heat exchanger; and a water pipe and a heater integrated with each other. 2. The hot water supply apparatus according to claim 1, wherein a heater is provided on an outer periphery of the water pipe. 3. The water pipe is constituted by an inner pipe and an outer pipe having a tip end closed and containing the inner pipe. The water pipe is housed in a metal pipe, and the metal pipe is connected to the metal pipe. 3. The hot water supply apparatus according to claim 1, wherein a heater is provided between the hot water supply pipe and the water pipe. 4. The water pipe according to claim 1, wherein the water pipe is formed in a U-shape and accommodated in a U-shaped metal pipe, and a heater is provided between the metal pipe and the water pipe. Or the hot water supply apparatus according to 2.